What does Virtual Bytes mean in Worker Processes pane in IIS7.5 Manager?
This TechNet article should help to explain:
Private Bytes (KB). The current size of memory committed to a worker process, which cannot be shared with other processes. This corresponds to Virtual Memory Size in Windows Task Manager.
Virtual Bytes (KB). The current size of the virtual address space for a worker process. This does not correspond to anything in Windows Task Manager.
The memory showing in task manager is the amount of physical memory in use by the process that cannot be shared with other processes.
This MSDN page should help explain Virtual Address Space:
A virtual address does not represent the actual physical location of an object in memory; instead, the system maintains a page table for each process, which is an internal data structure used to translate virtual addresses into their corresponding physical addresses. Each time a thread references an address, the system translates the virtual address to a physical address.
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UpTheCreek
Updated on September 18, 2022Comments
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UpTheCreek over 1 year
What does Virtual Bytes mean in Worker Processes pane in IIS7.5 Manager?
If I open IIS Manager (On WindowsServer 2008r2), and go to the Worker Processes page, I can see that one of my AppPool processes reports
Private Bytes (KB) 106,435.00 Virtual Bytes (KB) 748,788.00
However, if I look at task manager, the associated w3wp.exe process reports
69,276K
.Can anyone explain to me how these figures relate to each other?
Thanks
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UpTheCreek almost 13 yearsThanks, I hadn't seen that before. I've updated the answer with the definitions (needs peer reviewing). However, I still don't really understand what Virtual Bytes represents. What is meant by 'Virtual Address Space'?
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Rob almost 13 yearsAdditional info added about Virtual Address Space.
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UpTheCreek almost 13 yearsThanks for the update Rob. Does anyone really understand this though? I don't think I do. For instance, if virtual addresses are just pointers to physical addresses, then what does the size of the 'the current size of the virtual address space' mean?